26 Heb “And the word of the Lord will be to them, ‘tsahv latsahv,’ etc.” See the note at v. . In this case the “Lord’s word” is not the foreigner’s strange sounding words (as in v. 10), but the Lord’s repeated appeals to them (like the one quoted in v. 12). As time goes on, the Lord’s appeals through the prophets will have no impact on the people; they will regard prophetic preaching as gibberish.
27 Heb “as a result they will go and stumble backward.” Perhaps an infant falling as it attempts to learn to walk is the background image here (cf. v. 9b). The Hebrew term לְמַעַן (léma’an) could be taken as indicating purpose (“in order that”), rather than simple result. In this case the people’s insensitivity to the message is caused by the Lord as a means of expediting their downfall.
28 When divine warnings and appeals become gibberish to the spiritually insensitive, they have no guidance and are doomed to destruction.

In other versions

And the word of the Lord will be to them

precept upon precept, precept upon precept,

line upon line, line upon line,

here a little, there a little,

that they may go, and fall backward,

and be broken, and snared, and taken.

So then, the word of the Lord to them will become:

Do this, do that,

a rule for this, a rule for that;

a little here, a little there—

so that as they go they will fall backward;

they will be injured and snared and captured.

The word of the Lord will come to them:

“Law after law, law after law,

line after line, line after line,

a little here, a little there,”

so they go stumbling backward,

to be broken, trapped, and captured.

So the Lord will spell out his message for them again,

one line at a time,

a little here,

and a little there,

so that they will stumble and fall.

They will be injured, trapped, and captured.

And to them the word of Yahweh will be

blah-blah upon blah-blah

gah-gah upon gah-gah

gah-gah upon gah-gah,

a little here, a little there,

so that they may go and stumble backward

and be broken and ensnared and captured.

But the word of the Lord was unto them

Precept upon precept, precept upon precept;

Line upon line, line upon line;

Here a little, and there a little;

That they might go, and fall backward, and be broken,

And snared, and taken.

Public Domain